Be careful not to make too many books.
In a word of advice: Don't talk too much about the language.
("And besides this, my son, I have learned that making many books has no end, and much talk wears out the flesh" - Ecclesiastes 12:12)
Translation
Expression (Hebrew)
הִיזָּהֵר עֲשׂוֹת סְפָרִים הַרְבֵּה
Definition (Hebrew)
בִּמְלִיצָה בְּהַשְׁאָלָה: אַל תַּרְבֶּה לְדַבֵּר דִּבְרֵי לַהַג.
("וְיֹתֵר מֵהֵמָּה בְּנִי הִזָּהֵר עֲשׂוֹת סְפָרִים הַרְבֵּה אֵין קֵץ וְלַהַג הַרְבֵּה יְגִעַת בָּשָׂר"- קֹהֶלֶת יב יב)